feat: add icon field support to knowledge article tools

- get_knowledge_article: returns icon field
- create_knowledge_article: accepts optional icon parameter
- update_knowledge_article: accepts optional icon parameter
  (empty string = no change, preserves existing icon)

Refs: odoo-plugin-icon-field-request

server/odoo_mcp.py

@@ -76,12 +76,6 @@ def _keychain_delete(account: str) -> bool:
     except Exception:
         return False
 
-def _get_credentials() -> tuple[str, str]:
-    """Resolve username and API key: env vars take priority, then system keystore."""
-    username = ODOO_USERNAME or _keychain_get("odoo_username")
-    api_key  = ODOO_API_KEY  or _keychain_get("odoo_api_key")
-    return username, api_key
-
 def _get_credentials() -> tuple[str, str]:
     """Resolve username and API key: env vars take priority, then macOS Keychain."""
     username = ODOO_USERNAME or _keychain_get("odoo_username")
@@ -257,11 +251,11 @@ def search_knowledge_articles(query: str = "", limit: int = 20) -> list:
 
 @mcp.tool()
 def get_knowledge_article(article_id: int) -> dict:
-    """Get the full content of a Knowledge article by ID.
+    """Get the full content of a Knowledge article by ID, including its icon emoji.
     Note: Inline base64 images are replaced with [embedded image] placeholders
     to keep the response size manageable."""
     r = _read("knowledge.article", [article_id],
-        ["id", "name", "body", "parent_id", "child_ids",
+        ["id", "name", "icon", "body", "parent_id", "child_ids",
          "is_published", "write_date", "write_uid"])
     if not r:
         return {}
@@ -275,21 +269,35 @@ def get_knowledge_article(article_id: int) -> dict:
     return article
 
 @mcp.tool()
-def create_knowledge_article(name: str, body: str, parent_id: int = None) -> int:
+def create_knowledge_article(name: str, body: str, parent_id: int = None,
-    """Create a new Knowledge article. body is HTML. Returns new article ID."""
+                              icon: str = "") -> int:
+    """Create a new Knowledge article. body is HTML. Returns new article ID.
+
+    icon: optional Unicode emoji to display as the article icon in the KB tree
+          (e.g. '⚙️', '🔌', '🖥️'). Leave empty to use Odoo's default.
+          Browse available emojis at: https://emojipedia.org"""
     vals = {"name": name, "body": body}
     if parent_id:
         vals["parent_id"] = parent_id
+    if icon:
+        vals["icon"] = icon
     return _create("knowledge.article", vals)
 
 @mcp.tool()
-def update_knowledge_article(article_id: int, name: str = "", body: str = "") -> bool:
+def update_knowledge_article(article_id: int, name: str = "", body: str = "",
-    """Update a Knowledge article's title and/or body (HTML)."""
+                              icon: str = "") -> bool:
+    """Update a Knowledge article's title, body (HTML), and/or icon emoji.
+
+    icon: Unicode emoji to set as the article icon in the KB tree
+          (e.g. '⚙️', '🔌', '🖥️'). Empty string = no change (preserves existing icon).
+          Browse available emojis at: https://emojipedia.org"""
     vals = {}
     if name:
         vals["name"] = name
     if body:
         vals["body"] = body
+    if icon:
+        vals["icon"] = icon
     if not vals:
         return False
     return _write("knowledge.article", article_id, vals)